Control of office dictation equipment



'Jan- 1, 1952 B. ROBERTS 2,581,144

CONTROL OF OFFICE DICTATION EQUIPMENT Original Filed Dec. 21, 1946 a Sheets-Sheet 1 5&1

INVENTOR ATTORN EYS Jan 1, 1952 B. ROBERTS CONTROL OF OFFICE DICTATION EQUIPMENT Original Filed Dec.

8 Sheets-Shoot 2 PANY 9 o amen 66 72 PENNA THE INTERNATIONAL ELECTRONICS (OH 608 NORTH BROA PHILADELPHIA 50 TEL. P.0.5-785Z DATE FILE "0. 65 SUBJECT SHEET OF $HEEI'$ 70/ swam-um:

INVENTOR W W ,z-fir mb. ATTORNEYS Jan. 1, 1952 l B. ROBERTS CONTROL OF OFFICE DICTATION EQUIPMENT 8- Sheets-Sheet 3 Original Filed Dec. 1946 W W B Y 4 ATTO R N EYS Jam-1, 1952 B. ROBERTS CONTROL OF OFFICE DICTA'I'ION EQUIPMENT 8 Sheets-Shed 4 Original Filed Dec. 946

' INVE TOR ATTORNEYS Jan. 1, 1952 RQBERTS CONTROL OF OFFICE DICTATION EQUIPMENT .8 Sheets-Sheet 5 lNVENTgR I J JM.

Original Filed Dec. 21, 1946 ATTORNEYS Jan. I, 1952 B RO 2,581,144

CONTROL OF OFFICE DICTATION EQUIPMENT Original Filed Dec. 21} 1946 s Skeeter-Shea; e

INVENTOR (BMW ATTORNEYS Jan. 1, 1952 B. ROBERTS CONTROL OF! OFFICE DCTATION EQUIPMENT B'Sheets-Sheet 7 Original Filed Dec. 21, 1946 mQ Aw( & R W E w T k M E W m w A Y /5&3 538 x B %k\ p A v l WM l MW v3 Na mmrzie Jan. 1, 1952 B. ROBERTS CONTROL OF omucs DICTATION EQUIPMENT.

8 Sheets-Sheet 8 Original Filed Dec. 21, 1946 INVENTOR ATTORNEYS Patented Jan. 1 1952 CONTROL OF OFFICE DICTATION EQUIPMENT Bruce Roberts, Philadelphia, Pa., assignor to The International Electronics Company, Philadelphia, Pa., a corporation of Pennsylvania Original application December 21, 1946, Serial No. 717,754. Divided and this application March 27, 1947, Serial No. 737,692

13 Claims. (01. 179s) l I. GENERAL CONSIDERATIONS AND STATE- MENT F OBJECTS This invention relates to control systems for oflice dictation and intercommunication equipment of the type disclosed and claimed in my copending application Serial No. 717,754, filed December 21, 1946, of which this application is a division. In that application, I have described apparatus for recording intelligence on rectangular flexible sheets comprising particles of magnetizable material dispersed in a binder and capable of folding and creasing without injury. Such sheets are as readily adapted to immediate disposition by mailing or filing as are typewritten letters.

While such apparatus may be employed as a simple unitary device for producing in physical form letters, memoranda, and the like, simultaneously with their utterance'by their originator, the adaptability of the recordings to immediate disposition may be exploited more fully in an integrated system of dictation and intercommunication, in which such a unitary device is associated with other apparatus, with -means whereby recordings may bemade or reproduced at a location removed from the location of the person originating them or listening to them. The present application is concerned with control features disclosed in my copending application, Serial No. 717,754, and especially with a system of recording and intercommunication in which memoranda, letters, and the like may be reduced to a permanent physical form at a point remote from their utterance.

A primary object of the present invention is to provide for control and operation of dictating apparatus of the type described at a location removed therefrom. 1 Another object of the invention is to provide means for establishing intercommunication between the recording apparatus and the remote operating position, by means of which the activities of two persons stationed at the respective positions may be coordinated. The combination of the unitary device with intercommunication facilities constitutes a system for dealing with ofiice dictation in which letters or memoranda may be dictated from one location and-recorded in another location, and in which instructions as to the disposition of the recorded material may be transmitted to the second locathey have been made, or upon the lapse of time after their making, either at the location of the recording apparatus or at a location remote therefrom.

How the foregoing and other objects are attained will be more fully understood upon referencevto the description contained hereinbelow and the drawings,- in which:

Figure 1 is a perspective view of a master recording unit constructed in accordance with the invention and of its associated speaker-microphone and foot switch;

Figure 2 represents a remote unit, together with its associated foot switch;

Figure 3 represents the reverse of a record sheet for use in the practice of the invention;

Figure 4 is a sectional view of a portion of a record sheet made in accordance with the invention;

Figure 5 is a perspective view of the paper cylinder of the master unit, shown with a single sheet of paper wrapped thereon;

Figure 6 is a sectional view of a cylinder with two sheets of paper in position for recording in duplicate;

Figure 7 is a front view of the master unit shown in Figure 1, partly in elevation and partly in broken section;

Figure 8 is a sectional view of the master unit, taken along the line 88 of Figure 7;

Figure 9 is a detailed view of parts shown in Figure 8;

Figure 10 is an elevation of portions of Figure 7, with certain parts removed;

Fig'ure'll is a simplified view of the paper feed mechanism;

Figure 12 is a detailed view of the paper ejecting mechanism; v Figure 13 is an isometric view of a recording head; 7 p 5 tion and intercommunication system, a thorough understanding of the control features depends upon a knowledge of the basic apparatus and,

to that end, I have included herein a discussion,

of the mechanical features of the basic unit claimed in my copending applicationqSerialNo.

II. GENERAL DISCUSSION OF THE MASTER UNIT Turning now to the drawings and considering first the above-mentioned unitary device itself, Figure 1 is an exterior view of a master unit, generally indicated at 2!, which is mounted in and upon a cabinetgenerally-indicated -at 3ll1 -Associated with thema'sten unit is a local'speaker microphone unit 22, adapted to be connected-with the master unit by means of cord 23, plug 24, and jack 25. Localfoot switch 25 issimilarly adapted tobe connected-with the master unit by means of cordZ-l, plug 28, and-jack 2 9.

Cabinet 30 includes a front panel 3l, upon which are mounted-various control elements-and indicating elements, and an extendable back panel 32, hinged to the rearof the cabinet at..33, and maintained in adjustableiposition by spacer link Paper feed lever 35 and paper ejectlever iifi penetrate apertures 3l and 38 respectivelm at the left and right edges ofpanel -3l. Recording status i pointer 39' penetrates -a slot lll extending substantially across panel's! i ust-.:below scale :41. As the recording operation progresses, pointer .39 advances along. thescale, permitting ai.measurement :of the: recordingspace. or timealreadyntilized, or alternatively, the :amount of .recording space or time yetzavailable.

Disposed centrallymfpanel.3.l .areza :painof signal .bezels, 42a. and 43a, preferably of different colors. adapted to beilluminated by a;pair; of.

signallamps, 122iv andflbtrespectively (seeaiFi'gure. 17) under: certain conditions,;as wills-appear more fully hereinbelow.

Immediately below. the-.bezels isca poweriswitch 44; and below the power switchis: aipushlbutton switch 45 for controllingthe back spacingmechanism.

To the left of toggle switch flzis controlknob 46 for multi-position gang switch 41 (seeFi'gure 1'7) and to the right of'thetoggle switch ,isvolume control knob 48.fr-volumecontroldifl' (see Figure 16). 7

On the side of cabinet 30, adjacent jack 25, is a multi connector socket 50=adapted to be connected with a similar socket on remote speaker-microphone unit 52 (see Figure 2) ,The sockets may be connected by a .multi-conductor cable of conventional designer by any other means; the cable is.schematicallyindicated at 54 in Figure 17.

III. GENERAL DISCUSSION BE THE:

REMOTE UNIT. 1 Remote unit 52" includes-a'"buiIt-inpermanent magnet loudspeaker 53 (see Figure 17), which" 4 functions as either a microphone or a loudspeaker, as is well known in the art, mounted behind a grill 54. Foot switch 55, similar in structure and function to foot'switch 26, is adapted to be removably connected with remote unit 52 through cord 56, plug 51, and jack 58.

Mounted on the front panel of the remote unit is a bezel 59a, adapted to be illuminated by lamp 595 (see Figure 17) under certain circumstances, as will appear; signalling: push. button 65; a hold downtalk-listen" toggle switch 6|; privacy toggle switch 62; and back space push button 63.

IV, THE RECORDING MEDIUM Turning now to the recording medium, Figure '3: is an example of a recording sheet 64 bearing addresssfi'l, classification indicia 68, a heading 69,

and signature location indicia 10. The address space'is definedby'a box providing a reference for registration of'the address with the window of a standard window envelope. It is especially important, in records whose context is not visually comprehensible, to :provide means for indicating, the relative order and numberwofthe.

sheets comprising -a.zmultia-sheet record, and to that end, .I. have providedimeans .for.indicating the, position .ofeach-sheet in Such-arseriesl The recordv sheet may; :bev of. any convenient size, but preferably as illustrated in Figures-.3,

the. sheet. shouldbe of standard filetter size, for

example, 8 by 11". .Bystandardizingonz this size and shape of record;sheet, allthe-auxiliary equipment of letter communication 7 becomes available;v ..for example, standard envelopes, standard. file folders. standard file-:cabinetseand the like may advantageously be employedinth'e storageandhandling; of record sheetsrof this-size.

In addition to the dimensions, thespian-form of the sheet isicharacterizedby holes-Il .and'lZ and notched corners l3 and 'l' l, which together cooperate in maintaining therecord sheet in scanning, position in .my novel: recording, apparatus, as willappear more fully hereinbelow.

Asshownin the sectional-view ofiFigure 4, the sheet 64 comprises a. 'fiexible layer lfilcomprising; magnetizable particles, .preferably supported .by a flexible backing 1.5.

Backing member15lcomprisesa highly flexible,

resilient material, suchas papen. characterized.

by great resistance: to. cracking-.uponfolding-and creasing, and the; ability to assume *aasubstane tially fiat formlafter .flexure to-.a closed-loop or after creasing. The binderrforr the mag-netizable particles .has r similar properties, and ethereforefia record mediunimade inaccordanceewiththe invention is capableaof repeatedfiex-ing-tocylin? drical form and of "repeated creasing-andu-ncreasing withoutdisturbance of. thebond between the magnetizablematerial and=the backingmember. and without 5 interference 2 withzathmorientation of the individual magnetizableiiparticles irr relation to each other. The resilience Of thEHIQ- terial operates-to restore it -t'0 fiat form as itis released from'the cylinder which; is not only-ad vanta'geous"for purposes of ultimate-disposition,

. but-also aids in removing thesheet' from the ma chine, aswill appear.

' f have found that the bestpom-bination of the properties above discussed is obtained with asheetof from about one to'aboutfive thousa'ndth's of 'aninch' in thickness: and moshdesirablyywith sheets from two to thredthousandths ofarr inch:

v. SUPPORTING AND, MAINTAINING THE RECORD SHEET IN FLEXED FORM During recording and reproduction, a sheet 64 issupported. upona cylindrical form generally indicated at 11 in Figure 5. Cylinder 11 comprises a barrel 18 of non-magnetic material, for example, brass, a'ndtwo'end flanges 19 and 80, the diameter of the flanges preferably being slightly greater than that of the barrel 18. Cylindrical form 11 is adapted to be mounted by means of a shaft 8I, which protrudes beyond flanges. 19 and 80 at either end. I Form 11 is provided with a pair of hooks 92 and 83, projecting from barrel 19 near the ends thereof, in the same radial plane, and adapted to engage the holes H and 12 in sheet 64.

The circumference of the barrel should be no greater than the length of sheet 64; and preferably the circumference should be somewhat less than the length of the sheet, in order to provide for a slight overlap when the sheet is wrapped around the barrel. In the preferred form of the invention, standardized on the basis of 8 by 11" paper, the circumference of the cylinder is approximately Under these circumstances, notches 13 and 14 permit the paper to lie flat without interference from hooks 82 and 83, even though the notched (or bottom) end of the sheet overlaps the opposite end.

Cylindrical form 11 is mounted for rotation in' the upper portion of cabinet 30, as may be seen in Figure 8. The left end of shaft SI (see Fig-' ure 7) is journalled for rotation in side frame 84 and a pad 85 formed integrally therewith. The opposite, or right, end of shaft 9| is journalled in bracket 86 and pad 81.

Immediately below shaft 8| and to the right of drum 11 may be seen driving motor 88, mounted on side frame 89. Motor shaft 90 is in peripheral engagement with drive puck 9I (see Figures 9 and 10), which is mounted for rotation with a shaft 92, which shaft is journalled in shift arm 93. The operation of arm 93 will be described more fully hereinbelow; but it should be observed at this time that motion of arm 93 is adapted to carry puck 9! into and out of engagement with flange 19 of form 11, thus providing a selectively engageable drive from motor 88 to form 11.

VII. LEAD SCREW DRIVE In addition to cylinder 11, shaft BI also carries for rotation therewith a driving sprocket 94, located on the shaft between flange 19 and pad 81 (see Figures 7 and 8). Sprocket 94 carries a chain 95, which is in engagement with driven sprocket 96, secured to shaft 91 of lead screw 98. Lead screw shaft 91 is journalled at itsleft end in side frame 84 and at the opposite end in side frame 89.

It will thus be seen that the drive train for all rotating parts is: motor shaft 90, *movable puck 9|, puck shaft 92, flange 19, shaft 8|, sprocket 94, chain 95, sprocket 96, shaft 91 and lead screw 98.

VIII. CARRIAGE AND CARRIAGE DRIVE Lead screw 98 provides translational force for effecting movement of a portion of the mechanism axially of cylindrial form 11. This portion is mounted on a carriage 99 (see Figures 8, 9 and l5 for-large scale view). Carriage 99 is supported by and is free for axial and rotational movement'upon .axial way I00,-having. a rack IOI cut along one side thereof. The actual bearing surfaces upon which, the carriage rides are the internal surfaces of sleeves I02 and I03.

Mounted on carriage 99 are erase head I 06, recording head I 01, back spacing mechanism generally indicated at I08, pointer 39, half-nut I09, and a pair of tabs 0 and III. The mass of carriage 99 and. its associated parts is distributed around axial way I00 in a mannerto retain heads I06 and I01 against barrel 18 of cylindrical form 11, and to retain half-nut I09 in engagement with lead screw 99, by gravity.

Tabs H0 and III, which extend below axial way IX. CONTROL OF THE ROTATING COMPO- NENT OF THE SCANNING MECHANISM Both the rotational drive train and the r0- tation of carriage 99 about axial way I00 are controlled by a single electro-mechanical control system, which is clearly illustrated in Figures 9 and 10. Shift arm 93 is mounted for swing motion at its lower extremity on shaft II2, which provides a reaction point for the arm. At its upper end, arm 93 is connected with armature II 3 ,of solenoid H4, and intermediate its ends,arm 93 carries puck shaft92, discussed above, a spring I I5, and cross arm I I9. Spring II5 normally tends to pull arm 93 toward the rear of the machine, but exerts less force on the arm than does solenoid H4 when X. CONTROL OF THE TRANSLATING COM-- PONENT OF THE SCANNING MECHANISM The front end of cross arm H6 is connected to tab II1 of trip bar I I 8, which is capable of rocking motion on shaft I04. As may be seen in Figure 7, tripbar IIB extends practically the full length of axial way I00, so that regardless 'of the position of carriage 99, trip bar IIB may be brought into position against tabs I I0 and I I I of carriage 99. Figures 8 and 9 show the parts in the position they assume when solenoid H4 is energized-that is, with drive puck 9I in driving position, and trip bar II8 rocked forward, permitting the recording heads I06 and I01 to contact sheet 64 on cylinder 11 and permitting half-nut I09 to engage with lead screw 98. Under these conditions the cylinder rotates and the carriage is moved axiall of the cylinder by the lead screw. Now, if the circuit to solenoid I Id be broken, spring II5 will pull arm 93 rearwardly, disengaging the drive puck, and rocking trip bar II8 to the rear. The trip bar, as will be seen, comes in contact with one or both of tabs H0 and II I, exerting a torque moment on carriage 99 around axial way I 00, thus lifting the heads from the sheet and removing half-nut I09 fromengagement with lead screw 98.

XI. THE SCANNING PATH The combination of the rotating scanning component effected by'rotation of cylinder 11 "and the translating component effected by translational movement of carriage 99 on axial 'w'ay I00 provides means for efiecting movement of ithe recording-I :head nelativeisto :ithe record medium; in two. idirectionscsubstantiallycnormal .to each othen'rt'lihe interrelationlzofs these two components makes: possible: :theasc aiming: of: the entire record :area in 1a: series ;.ofs.;side-;byside track portions. Preferablyntheutwo components areminterrelatedzin a::manner .toiziprovide :for simultaneous translational landrotationalsemove .m'ent whereby :to' provide forzla continuous helical track intersectingzathezlineof overlapping of: thexopposite :edges of: the :recordosheet.

, XII. CARRIAGE.- BACK .SPAGE =A c, second scontrol a system, I 08; -is completely carried by carriage ilil; and serves to eifect back spacing. This-mechanism is shown indetail in Figure 1 5,- and includes an' electromagnet I I 9 a housing 11 I 20, and a: non -magnetic member "-I 2 I hinged to the housing 'member-at l 22. spring I23'.exerts a turning moment on member I2I tending to. carry-free end I 2 4;of.member I2 I- away from the electromagnet. Hinged to member I2I at-end I24-is an'armature I25;oneend- I26 f the armature being in alignment with the core of the-'electromagnet' and the other end bearing a pawl I2'I,- adapted to" engage-rack I0 I of axial way- I00.

*When electromagnet-I I9 isenergized,--member I2I is at first una-fiected'; but end 126- of armature I is-drawn toward thecore of'the electromagnet, thereby-forcing pawl I HIT-into" engagement-withrack' ili I However, as-soonas end- I28 comes --in-contactavith member 12 I the turning movementon point' i 24 terminates, and the full force of the magnet on thearmature is now transmitted to-member* IZI Whichturns on point I22. Tooth-I2"! now'exertsan axiahpressure on rack 4 'I B I advancing carriage 99 untilmember I2I=abutsonhousing I2fiat point I28.

XIII. SEMI-AUTOMATIC. RECORD. LOADING In addition to the mechanism for. accomplishing scanning of a record sheet, as described above,

:cabinet 30 also contains semi-automatic means "Arms I36-and I31*are secured"to'shaft 'I35' for rotation =therewith, *while arm' I 38 is loosely mounted for rotation on'sleeve-I 4 Iyservingmerely to aid in aligning 'its end of shaft 'IM-and to afford a reaction point for a spring *I39,-'which acts to fcrce finger- I3ikagainst the paper. Each finger I38 is provided with such a spring, the left hand spring having for areacti'on point arm 13%. Rotation of -shaftflfi is e'ffected bymoving lever '35. As will-be seen; depressing lever' '35 forces fingers 4-30 upwardly against the tension of spring "I 38a; andsince pads- 13k are coated to provide more friction between them and the sheet of paper 64 they contact than exists between that sheet and theadjacentzsheetgthe sheet is raised to a position where its upperedge enters the space.betweenpapenguidell Bfl andldruml 11. As the cylinder. rotates, hooks-inland 83 enter holes I I and ]2..in"sheetfl fid drawingjthewsheet cylinder. EPapenguide I8Landpap1errguide l3a maintainzthes'heetin it'sifiexedfornr onwcylinder TI.-

xrv. snt/mAUToMA-TI o ancient)? .The paper 'ej ection' mechanism is illustrated in Figures 7, .8 and"12. A sleeve I4I, "rotatabiy mounted on .shaft" I35; is secured at;one-;end to lever 36 andattheotherto acranli I42 carrying atlink Hi3. Adjacent link I43 I44, loosely .mounte'd'for rotation'on shaft 135.. Links I'43gand I44 are kept in substantial'axial alignmenfl'by pairs of. loose fitting guides I45 'formed'on" link I43. An ejection lever I46carrying,a"pad'-I4I' is secured. tolflinks I43 1 and IN at I48 '3 and I49 respectively.

When 1everi36is'depresse'd, crank 5'42 rotates in a manner to shift link I43 downwardly relative to'link I44 againstthe tension ofspriiglg Idea, raisingpad' I4! and moving'it' into engagement 'withdrumllthrough slot I33bin'paper guide I33a. When the pad can no :longen'swing upwardly; the whole assembly, consisting of-"crank I42, links" I43 andi i l, lever lfiiiyjand'padflli will'pivot about shaft I35; spinning drum 'i'l in a clockwise, or "reverse, direction. Since-*the paperffi l on drum TI has a I'latUIQYIZGDGBIIQytO straighten out; the sheet will'peel-offputsideback wall ISB-of-reservoir 12s and be'dcposited betwecn wall I59 and adjustable-back'panel 32.

' In Figures 15 and '7yis "illustrated-mechanism for stopping the drum ina predetermined position prior to operating the ejection mechanism, in order to insurethat, the trailing edge 'of sheet 6 3 will be in -.theiproper'angular:position in relation to back wall; I Ellfof: magazinejtI 29. This mechanism includes a"cam"8Ia' "mounted on drum shaft Bladjacent'one end of drum TI. 'Cam' em has a circular'profile-interrupted by a" depression. Switch I43 includes a rotating cam follower Iiila adapted to' engage with the depressionto separate the switch contactsJTSwitch "M9, together with push button switch I88 (-seealso'F-igure ll'serves to provide an additional path forenergizingcurrent for cylinderdrive engaging solenoid H4. This circuit-is completely independent of the normal operatingcircuit comprising foot switches-zfi and and limiting switch "i 88. *W hen it is'desired-to eject asheet; switch I88 is closed-b3," the operator and solenoid il will be energized-"so :long as cam follower I ma, is incontact with the high portion of =camll I a. 1 As aresult; =the=drum will rotate until follower I400, drops into thedepression separating the--switch:contacts, and deenergizing solenoid H4. The cylinder will stop in a position determined by theangular-location of -the-depression. This -angularposition"'"is arranged to correspond with a position-of the trailing edge of sheet appropriate .to election in the" desired f'direc'tion; Preferably, as in -the form. illustrated, the depression. is l arranged ,-.to stop the cylinder'when the-trailing edge of. sheet 84 is somewhat past the edge ohreanwalldfitlof the ,paper. magazinewhioh. strips the-sheet from the.drum-.on reverserotation thereof. -0nce the drumhas been. rotated: to and stopped in: this position, .the .paperlisn ejected by operationeoi lever 36 as described above.

, Figure .13 is alphant-om view pi. a, recordingihead from the reservoir and. wrapping it aroundlthe .used inoneembodiment ofthain-vention. 1: Shown in outline is housing II containing a laminated core I52, coils I53 and I54 and composite pole pieces I55 and I56. Figure 14 is a detailed View of the polepieces of. the recording head on an increased scale in which may be seen a nonmagnetic spacer I51 which performs the function of maintaining the'gap between pole pieces I55 and I56 constant.

As is well known in the art, the same electromagnet may be used both in recording and reproducing magnetic recordings, and accordingly, head I01 is connected to alternatively perform both of these functions, as will appear more fully hereinbelow.

Electromagnets I06and I 01 are mounted on carriage 99 with erase head I06 ahead of recording head I01. in a scanning sense. ment is arranged to provide for energization of the erase head during recording operations, so that any previously recorded material on a record sheet is obliterated just in advance of the recording head, whereby the recording head is always presented with an unrecorded record track, By this means a double exposure Furthermore, it is unnecessary to perform any separate erasing operation inasmuch as a previously recorded but unwanted record sheet may be inserted and simultaneously erased and rerecorded. The switching arrangements include a circuit for rendering the erasing head ineffective during reproduction.

XVI. THE SPEAKER-MICROPHONES It should be here stated that speaker-microphones 22 and 53, while they may take any form, preferably comprise in each case a single permanent magnet loudspeaker which, as is well known in the art, is capable 'of functioning either as a microphone or as a loudspeaker.

XVII. THE AMPLIFIER Figure 16 is a schematic diagram showing an amplifier I58, power supply I59 and oscillator I60, all of which are mounted on chassis I 6| (see Figure 8). While the amplifier, power supply and oscillator have been shown in separate dotted boxes, it is to be understood that this device is employed for clarity of description only and does not necessarily represent the physical oranization of ungrounded input connection I62, grounded 'input terminal I63, ungrounded output terminal I64 and groundedoutputterminal I65. Power supply I59 includes a power transformer I66 having high voltage winding I61 and low. voltage winding I 68 all of the vacuum tubes and also delivers low voltage relay current to ungrounded terminal I69 and grounded terminal I10. In addition, primary voltage is delivered at terminals HI and I12. Transformer primary I13 is adapted to'be fed at terminals I14 and I15. It should be noted particularly that negative direct voltage lead I16 is not grounded but is connected to terminal I11. Oscillator I60 delivers high frequency voltage to ungrounded terminal I18 and grounded terminal I19. It should be noted at this time that one side of the amplifier input and output, oscillator output, and relay current output are grounded, and similarly, that one side of each of the speaker-microphones, erase and record heads, and various solenoids are grounded, making possible the interconnection of all of the above cir-- cuits by means of single pole switches.

The equipis impossible.

the parts. Amplifier I58 includes which supplies filament voltage for.

10 xvm. GENERAL DISCUSSION OF CABLING AND SWITCHING Figure 17 is a schematic diagram of a complete ofiice dictation and intercommunication system laid out in accordancewith the invention. As may be seen, masterunit 2 I, diagrammatically indicated by the large dotted box, includes not only the recordtranslating mechanism and the amplifier power supply and oscillator discussed above, but also includes gang switch 41 controllable at the master unit for establishing manual recording or reproducing or intercommunication conditions.

Master unit 2I also includes a multi-contact relay generally indicated at I80 and controlled by hold down'toggle switch 6| in remote unit 52. Sections I8I and'I82 of relayI80 serve to reverse the connections to the input and output of amplifier I 58. Section l83'serves to'connect; the output of oscillator I6,3 -.to recording head I01 under the two operating conditions corresponding to recording. Section I84 of relay I80 serves to short. circuit erase head I06 at all times except during recording.

XIX. INDEPENDENT OPERATION OF THE MASTER UNIT Before considering the operation of the comthrough section I8I" of relay I80, and switch sec-"- tion 3 connects the local speaker-microphone 22 to the input of amplifier I58. Switch section 4 is inoperative in this position. Switch section 5 connects the output of oscillator I to record head I01. Switch section 6 is open, with the result that erase head I06 is in series with the negative high voltage lead I11. The device is now set for recording. The-dictator now depresses foot switch 26 and speaks into speakermicrophone .22. The closing of switch 26 energizes solenoid I I4, engaging the drive from motor 88 to drum 11 and lead screw 91. Whenpauses occur in dictation, the foot switch 26 is opened and closed again just prior to the continuation of dictation. If it should be desired to redictate a portion of the material, push button 45 is depressed once for each backward step desired 1 until, for example, the carriage 99 has been carried back to a point somewhat before the point at which the redictation is to commence. Gang switch 46 is thrown to the Local Play- Back position (B) and foot switch 26 closed until the last of the material which is to be retained is heard, whereupon foot switch 26 is raised, knob 46 is again turned to position A and dictation resumed. Inasmuch as erase head I01 is'energized during the dictation, thepreviously recorded material'will be erased just priod to rerecording.

As carriage 99 approaches the end of drum 11, switch I85 opens and lamp 43b is extinguished. This serves as a warning that the recording space has been almost filled. Shortly thereafter, carriage 99 opens switch I 86, which is unitarily mounted with switch I 85, as shown in Figure 10,breaking the'circuit to solenoid ,I I4 and thus terminating the. scanning. The recorded sheetf'may then be ejected by operation of papemejectibnvlevem363as:descriiiedzihiSection; byswitchpfl impositions CfiandD;mayiaberseen-inr XIV, or the carriagainaylbexetumed to the left- Table below; handesidebyumoving pointemBB with thefingers Table-B. tontheextremeeleft.tofilscalewll,. and themecorda POSITION AND,FUNGTIGN;O,REMOTERECORD reproducedby switehing. knob dilate positionA :55,- andtidepressingnswitch;26. Connection Connection Thus it .may ,be seenethatlthe first ltwo po si-- Switch Section and Function Relay Not Rclay-= tions;of knob tfiiand thereforeof switch 47 core-V Energized Energized respond; tow-recording: from 210031 microphone. 22x andtplay back-and reproducinga recordea-t .loca-L speakeremicrophone. 225 When master 1 unit :2 I A is operated independentlmthe relay 1 Bmis -never energized, and therefore only one set o.-connec+v tionsxis.lestablishedr-by1agiven switch position. However; .Tablcr A 1 1 have listed: the circuits if: r whichweuldebe established if i the relay were; energized-uni. order; to maintain consistencywith- POSITION AND FUNCTION'D REMOTE PLAY BACK the description of: the eoperation .ofnswitch 4'! in 1. .Motor; A. vO; Supply; AUG. Supply. 2. Recording Head AmpIificrOut- Amplifier 'Iiiput. put. 3. Local Speaker-ltficrophone: 4. Remote Speaker-Micro- Amplifier In=. Amplifier Out-r phone. put. put. 5. Oscillator Recording .l

Head. 6 Erase Head Oh Grounded."

the othereoperatmgemsiticms:e 1., Motor A. 0. Supply" A. CfSup'plyh 2032. Recordlngflead: Am'tzlifier' in Amofilifier Joutpm.v pm." 7 7 Table A 3."Loca1"SpakerMlcr0phone POSITION AYIl'FUNCTION=-AI LOGAILREQORD mZ P fi U .11 V

l 5. Oscillator e- -w, -v v Cmmectmm, o 6.-Eras Head; -e Grounded-:". Grounded. Switch Section and Function Relay 'No't Relay- 2 V 1 Energizedm I, Energizecti XXI. GENERAL DISCUSSION- OF INTER! 1.Mt Q. alos 1-. A.G.S 1, 2. R c din'gfi'ead.zimplifi i gt w -Ampllf i 1 m COMMUNICATIQN FEATURES ut. ,put. AgmmmU m Amplifier out: Whlle 1t 18 thus possible to either produce o 1 re I put; uty; 33; produce-recordings at remote unit'fiafl,the'switch' 4.RemoteSpeaker-Microphone. .l a i oscillator: Recording, me from p0s1t1on Q to D must still be accom Heads; phshedatmasterumti t.

fivEtaseHead Grounded" In order to coordinate th activities Of pgrsons V atlboth operatingepositions; I ;have--'provided,:in POSITION FUNCTIONB'LOGAL PLAY BACK addition-to theiremote' necording.andreproducina MD A G s Gr 8 1 circuits; two rseparatefiintercommunication';cirr- 1. tor; upplm. I uppity, i l i zR o -di g m fi: -Ampfifierr]:ni. v b -npnfle'r;out; p of theseils ccrn a put; I putrl prlses axsystem ofyoice-commumcatlon. 3.1 LocalBpeaker-Microphone);. Amplifier Out- Amplifier In-r 4 v pun-- put.-- XXII. VISUAL INTERCOMMUNIGATION" 61""aif'" "d "'"df:f me as mm 6 mun e and push button 60. Aswill be seen. from Figure 17;" push' button '60 ,iwhi'ch is normally: closecLIis in HT-REMOTEKOPERATIQNL; series'witlr the energizing current .to lamps 53b and 5963" B3 depressinEpushhuttonfiiiandihus breaking'thecircuit-fio .thelamps, a person at remote unittfii" may '"break-andemalze the circuit. tofiamplitbj "whichis :mountedbehind bezel 13 As has been setforth above," it is contemplated that a master unit 2 I I will 'be -employed "in conjunctiom with or remote-unit 52, whereby-' records ""m '9 t ft persorilfremote' onmaster unit '2! and thus may flash a signal to from the--1ocat1on-of'masterumt'il. As may be thepersomamhemastnmit o seem-in Figurel'ljpositionsfl and Dof'switohl" V 4 correspond'exactly to positions "A 1 and" B; 'with' XXIHMVOICE' INTERCQMMUNICATTQN g g l dci p 25; 2 5 1 2g} p g l ggl i The voice communication 'cirouit includes 500111190 G pp a amplifier-I58; local speakewmicropl'io'ne 32'; and ns ea e q p t i qg i 0011" remote speak'evmicrophone -53 togeth'er with sec-- e ty t h's t p w h' l, 55 tio'ns 3and 4 of switch (3?;- As may-b-seenupon 5 and-'6 'functionboth m'recordmgand'play b examination J01: ethefigure; :in' positions Eiland y do 'IJD Avan'd Thus; W t switchrrsectionzl breaks dihecircuit to motor. 58; switch 413 in-position C, a person at remoterunit switchnsection:2';breaksathe::.cirouit tofrecording 52 .lmayamake a.record1..contro1lin'g ithe engage: h a 0T, wi h ec ion 5 bre ks. he circuit to ment ofl the driye by means offoot Switch 55 oscillatorlfifi; and switch section 3 short circuits controlling.backspacmgbymeans of pushbutton erase; headelflfi connecting vthe. negative high 63.; Theseeontrols areconnecteddmparallelwith. e g u pfsemay the-correspondingzcontrols of master unitZL and f Crbelowrswltch'Swims-3 werammsxactWmesame Maya simimflmlamp 4 111. positlonlii,connectlocal speakerrmlcrlophone 59b is connected in parallel with lamb-43b: and t t flp m v p a is controlled bywarningswitch I85 :in exactly the g gf F amlillfiel F same s-mannere Assmaybe seenzuponareferenceto .1 W0 W i hese; connec r trons. Thus, the operator of master unit .21 may the last column }HLT%b1BzB, includedrdi rectly bee w person ataremote 11111152 turning 9 alpersflmdlvctahng P P F -Y control-knoblfito position Ff andmaylisten to llstenito whathe-hasrecordert elther tr a person at remote unit 52- by turningcontrolknob lrlgia 136158011, at the masterumt to. switch'to D08 46 to' position E; There is thus established an tion D, or, if the switchvis set at position Cg'he intercommunicationcircuit" between the two units may play back-his' record by operating relay I89, under the-control of the operator'ofunaster unit controlled by switch B l The'circuit's establishcd 2 I. In additibnysections-"l flt and 182"of ma -lac are arranged to invert the connections of the local speaker-microphone and the remote speakermicrophone to the amplifier when the relay is energized by closing switch 6! on remote unit 52. Itwill thus be apparent that when knob 56 is either in position E or F an intercommunication circuit is established between the two units which may be controlled by operation of switch Bi. Table C illustrates connections established in POSITION AND FTlECTION F INTERCOMMUNICATION MOTE TO LOCAL Motor Recording Head Local Speaker-Microphone 4. Remote Speaker-Micro- Amplifier Output. Amplifier Inphone. 7 put. Oscillator Grounded Grounded.

. Erase Head It should be noted at this time that remote unit 52 is provided with a privacy switch 62 connecte'd in series with remote speaker-microphone 63, whereby a person at remote unit 52 may prevent eavesdropping by any one at position 2| by opening switch 62.

XICIV. PLURAL RECORDING In addition to the functions of dictation, reproduction and intercommunication, the apparatus of the invention is adapted to the production of plural recordings. Although it will be understood by those skilled in the art that this novel recording apparatus makes possible the simultaneous ,recording of several letter type sheets by connecting an appropriate number of recording units together, I have found that even with one machine at least two layers of record sheet may be simultaneously recorded by the same recording head. In accordance with this aspect of the invention, a pair of record sheets 64a and 64b are mounted upon barrel 18 of cylindrical form 11, and when employing the preferred form of record sheet having a coating on one side, they are mounted with their coated surfaces 16a and 16b in juxtaposition, as illustrated in Figure 6. The two sheets are secured to form 11 in the usual manner by hooks 82 and 8 8 which penetrate holes H and 12. The recording is made through backing portion 15a of the outside sheet 64a. It should be pointed out that this technique depends upon the maintenance of positive alignment as between the two record sheets throughout the recording process. The method of securing the sheets to each other and to the cylinder illustrated in the figureby means of hooks 82 and 83results in effectively maintaining this alignment.

While I have found that the innermost layer is recorded at a somewhat lower signal level than the outer layer, this is of small consequence, since the level of reproduction may be controlled within wide limits by manipulation of volume control 49, and therefore, as will be understood,

xxv. MODES orv OPEItA'I'ION Y The unitary devices may be employed withoutremote unit 52 and without the features of remote control and intercommunication. Under these conditions, local speaker-microphone 22 and foot switch 26 will be positioned at or near master unit 2|, at the convenience of the person dictating. If the user of the apparatus desires to send a typewritten letter, he may dictate the material of the letter according to the technique outlined in Section XIX, whereupon the record may be played back by the person who is to transcribe it, or the sheet may be removed from the unit to be reinserted in another unit for transcription, or for transcription at a later time, using the same master unit. If the operator of, a single master unit desires to transmit the record sheet to his correspondent without transcription, he operates the mechanism in accordance with Section XIX. If it is desired to retain a copy, two sheets are placed on the cylinder. Upon the conclusion of the dictation, the record sheet or sheets may 'be removed, identifying indicia applied as exemplified in Figure 3, the first sheet.

folded, and inserted in an envelope for transmission by mail to the correspondent, who, .on receiving it, may reproduce the record by inserting it in this master unit 2| and following the,

procedure outlined in Section XIX. The file copy may be stored in flat or folded form as desired.

The operation of the complete system, including remote unit 52, involves two persons, for example, an executive stationed at remote unit 1 52, and his secretary stationed at master unit 2|. Under these conditions it will be understood that'complete voice intercommunication between V the two parties is available when switch 41 is in position E or F, as outlined in Sections XXI and XXIII. If the switch has been left in either of these positions, for example, position E, the ex ecutive may communicate with his secretary by closing switch Bl, operating relay I80. His voice will be reproduced at the master unit speaker microphone. If switch 41 is in position F, he may speak to his secretary without operating the relay. If the switch is in one of the other four operating positions, he merely signals to his secretary by operating push button 60, breaking the circuit to lamp 43b, causing this lamp to go out, to switch to position F and establish voice communication. Having established communication with his secretary, the executive may then give her instructions appropriate to his next step; for example, he may say, I want to dietate a letter, in which case she would set switch 41 in position 0. The executive then dictates his letter into the speaker-microphone of remote unit 52, depressing foot switch 55 during the periods of active dictation and releasing it during pauses. If, at the conclusion of his dictation, the sheet has not been completely recorded, lamps 43b and 5912 will. still be illuminated, and he may communicate with his secretary by depressing push button Gil as before. If, on the other hand, his dictating should carry him to the end of the record sheet, switch I will be opened by carriage 99, darkening the lamp's'and signifying to both persons 'that-a new sheet must be inserted. The secretary will then, as a'matter of routine, insert another record and return the carriage to near; 144:

thcstartihg positihmbyrpushingipointem to fiche: left-mend :sidezzofiiscale 4 I"; whereupon .the nights;

will-a againsgo :onaandethe: executiue maycresume; his dictating. Upon completion ofizthealetter; whatevec, itsglength the secretary may. be instructed to dispose of it either by transcribing it to -typewritten form w on by dispatchingi: it; :immediately to :its destination: Of; :"courseadupliicatesmay be made-in i cxactl yrith'e same:manner'- asioutlined above;

XXVILII CONCLUSION??? Thus, thednventionprovides: fonztlie; immediate 1 preparatiorrsat aupositioniremovedifrom thnpreset ence! cfc its; originator; leavingiiiim ;free .to- 100R? centrate his: energies eenulthe formulation .ofi'thea letterin- .Finally, the-invention: combineswthe speediand efiiciencyezof dinect recordingnvith thel ease and convenience :ofi' disposition lconflncd heretoiore to written records i= r Beyond theiimmediately ioregeing advantages which have heretofore =never been. realized; I a di'c ratin and intercommunicationx systemestablished; according to this invention performs with;

a'rniniinumof-apparatus and-'a-maximum of con venience all of the conventional functions heretofore achieved in' know-n: systems only at the expense of; employing: awkward techniques -111- voiv'ing a'- great multiplicity of equipment.

To illustrate; a system establi'sh'ed acccrding to-thisinvention involves' a-single unit atthe eX ecutive station andasingle unit at mesecretarys station. ample-supply *of record sheets may cc-stored within the machine at the secretarysstation; The executives simple remote unit, which affords him facilities -io1'-"dictating records; reproducing records;- and communicating witnhis secretary in two dircctions;-replaces the single function,mechanica1 sound 'reccrding de-' vice-formerly required, the singie iunction'intercommunicatiomunit formerly required," and the storage'iacilities formerly "required for blank records. At the sec'retarys stationy-the masterunitfi of" this-'invention=' replaces-"not only; the single functio'ntranscriber of-th'e, prior art andthe in tercommunicatic-n unit familiar in many ofiices', but also therecord shaver and the stora e-cw pacity necessary to "maintain a supplyiof -'recorded and-new record-blanks.-

In' addition, while the complicatednevices of the prior art'theoreticaliy relieved the :secretary lining current, a first speaker-microphone :unit, a

ofthe necessity of spending at least halfjof' hei:

time in r takingidictation; they did so at the TEX pense-ofadding to her burdenth'e tasks of shav old :recordsi'and'thelugging back and forth of" fieshlyfrecorded "andfreshly: shaved record blanks. Accordingrto the presentinvention; this fetching and carryingis replacedbyinstantane ous electronic transmission. vThe recording. is made in the location; and-Hint the r very-machine where .it is tohe itranscribed ii: :it -is to .be :tran-v scri-bed;;and=if it is not pit isatia-placeasonvenient ion: whatever other disposition: has abeen- .desig: natedjioriitt- Izclaime 1. Apparatus for recordingand-reproducingin:- telligence on removable flexible: sheets comprises ing magnetizable materiaL; comprising: arecordr: ing-reproducing head, an erasing head, mechanism for efiecting scanning of a sheetzby said" heads,'an amplifier having an input terminal and an output terminal-,an oscillator having an out-'- put terminal for-supplying recording bias, a'powe er sup-ply having a terminal for'supplying erase;

second speaker-microphone unit, switch means for connecting either or" said units to either of the amplifier terminals when the recording reproducing head is connected to the other of, the. amplifier terminals, switch means for connecting either of the said units to either of the amplifier terminals when the other unit is connected to the other amplifier terminal, switch means for connecting the oscillator output terminal tojthelre-i- 29-1 cording-reproducing head when the recording-- reproducing head is connected to .the amplifier .Y

output, and switch means for controlling the power supply to the erase head to energizersaidi erase head when the record-reproducerhead is connected to the-amplifier output. a

2. A dictation and intercommunication system comprising two stations, one of said stations comprising a speaker-microphone; and. the othercomprising a magnetic recording device adapted;

i oriuse witht'foldable, rectangular record sheets and including a recording-reproducing head,,and' a second speaker-microphone; the systemcfurther' including an amplifier having an input circuit and an output circuit,.a pair of amplifier terminals, switch: means for connecting each:off;said

circuits toone of saidt'erminalsiand iorinverting the connections'between .theamplifiervand the. terminals, and additional switch .means for connecting the 'head to either of saidterminals and for connecting either of the speaker-' mic'rophones to either of'saidvterminalmmeans iorcontrolling one of said. switch meansirom oneqstation and means for controlling, thecther of .saidnswitch' meansir'omthe otherstaticn.

31' Avconstructionr in accordance with. claim .21 and J further including i at eacn station" control means i for initiating andQterminating. .op,eration of saidrmagnetic recording device.,.

4. Axconstruction inaccordancewithiclaimlin which said magnetic recording, deviceincludes a.

recordingrbias supplyvforcsaidhead, said bias sup:-

troLfor said-backspacing means ateachof: said. stations.

6. 'In a dictation andv intercommunication: systenna first unit capable .of producing recordings onv :foidable: magnetic record blanks .adapted:. .to' immediate disposition; without transcription;

comprising magnetic recording-and reproducing mechanism,

selectively obliterating a portion of a recordingincluding speaker-rnicrophone;v means; andqaddia tional A control means for said. mechanism, said.

system further including controlcmeans .foriesa tablishing a plurality Offiii'EuitfivWhEIElbY recordings. .rr1ay-.:lo:.= made. and; reproduced 9.11s either.- of; said-,.,units, and; whereby voice communication cam-be established .betwcen-saidz-units-,=-andcone;-

local' speakerani'crophone-- means' control means or said mechanism; and rneans for trol means in each of said units for controlling said rerecording means.

7. An oiiice dictation and intercommunication system comprising two operating positions, the first operating position comprising a magnetic recording device adapted to produce and reproduce recordings in the form of flat, rectangular, flexible sheets carrying dispersed magnetizable particles and including a speaker-microphone, a recording head, an erasing head, means for translating said heads relative to a record in one direction said means being coordinated with means for bringing said heads into contact with a record, and additional means for effecting translational movements of said heads in the opposite direction, and control mean for simultaneously bringing said heads into contact with the record and effecting said first translational movement, and further control means for efiecting said reverse translational movement with said heads out of engagement with the record; and the second operating position comprising a speaker-microphone; and means at each operating position for initiating and terminating both of said translational movements.

8. An ofiice dictation system comprising a secretarys equipment and an executives equipment remote from the secretary's equipment, the secretarys equipment comprising recording mechanism for recording intelligence on record blanks,

and the secretarys equipment further including means for locally reproducing recorded intellisome for purposes of transcription; and the executives equipment including means for recording his dictation on a record at the secretarys station, and executives equipment further including means for selectively rerecording a section of a record and for concurrently obliterating intelligence previous to rerecording in said section.

9. A dictation and intercommunication system comprising a first station including a first speaker-microphone and a second station including a second speaker-microphone, a record scanning mechanism, a magnetic recording-reproducing head, an amplifier, an erasing head, current supplying means therefor, primary switch means for connecting the amplifier input and output circuits with the speaker-microphones and the head in a plurality of combinations, each including the amplifier and two of the other three elements, and for controlling said current supply to energize said erase head when said recording-reproducing head is connected to the amplifier output, and secondary switch means for inverting the 18 connections to the amplifier established by the primaryswitch means.

10. A} construction in accordance with claim 9 and further including a source of biasing current for said head, said source being controlled by said primary and secondary switch means to bias said head only when said head is connected to the amplifier output.

11. A construction in accordance with claim 9 in which said supply is further controlled by said secondary switch means to cut off said current when the secondary switch means is operated to invert conditions established by operation of the primary switch means as described in claim 2.

12. A dictation and intercommunication system comprising two stations, one of said stations comprising a speaker-microphone; and the other comprising a magnetic recording device including a recording-reproducing head, and a second speaker-microphone; the system further including an amplifier having an input circuit and an output circuit, a pair of amplifier terminals, switch means for connecting each of said circuits to one of said terminals and for inverting the connections between the amplifier and the terminals, additional switch means" for connecting the head to either of said terminals and for connecting either of the speaker-microphones to either of said terminals, means for controlling one of said switch means from one station and means for controlling the other of said switch means from the other station, and a signal device automatically operative after a predetermined period of operation of said magnetic recording device.

13. A construction in accordance with claim 12 in which said signal device is also adapted to be actuated manually from one of said stations.

BRUCE ROBERTS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

